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package fr.ove.openmath.jome.model;

/**
 *
 * @author Mr.Sam
 */
import java.util.*;
import fr.ove.openmath.jome.model.FormulaTreeStructure;
import fr.ove.openmath.jome.model.events.ModelEvent;

/**
* The operator "+", which is the unary plus.<BR>
*
* <CODE>UnaryPlus</CODE> represents a node in the formula tree.<BR>
* Its children are the operands of the operation.
*
* @author © 2000 DIRAT Laurent
* @version 2.1 10/01/2000
*/
public class UnaryPlus extends UnaryOperator {
    /**
    * The Constructor.
    */
    public UnaryPlus() {
        setResourceIdentifier("UNARYPLUS");
        setValue("+");
        setAsOperatorPriority(resourcesManager.getAsOperatorPriority("unaryPlusPriorities"));
        setAsOperandPriority(resourcesManager.getAsOperandPriority("unaryPlusPriorities"));
    }
    
    /**
    * Inserts the operator instance in the formula tree, from the current insertion position.
    * (checks the priorities and goes up in the tree if necessary).
    *
    * @param ope the current insertion position.
    * @return the new insertion position.
    */
    public FormulaTreeStructure insert(FormulaTreeStructure current) {
        // Le seul moment où l'on fait appel à cet opérateur, c'est pour la saisie d'un
        // plus unaire, et donc où l'on a une instance de Addition qui est en fait notre
        // point d'insertion courant, i.e. current.
        // On peut ajouter l'instance courante telle qu'elle.
        current.addChild(this);
        
        // On insère notre template dans le FTS
        VariableOrNumber template = new VariableOrNumber();
        addChild(template);

        // On retourne la reférence de notre dernier point d'insertion.
        return template;
    }
}
        
